Help....

[ronald_sas]

hi! i'm a newbie here.
could u please tell me about optocopler ???
with shematics diagrams.....

PS : I'm using 2s28 optocoupler
thanx

 

[gogo2520]

  Hello ronald and welcome
  Heres a small tutorail on opto's
            Have fun gogo

optocoup.pdf

 

[ronald_sas]

Thx, but i don't use ic optocoupler. I means not exactly optocopuler but
"distance sensor" which consist LED infrared and phototransistor.
I'm really confused.......can i get some tutorial...... pls.... ???

 

[audioguru2]

Your IR distance sensor is the same as an optocoupler. The difference is that distance causes the phototransistor to receive less IR because the IR beam spreads out and therefore its energy is divided over the wider area.

 

[ronald_sas]

Oh I get it...
Can u tell me where the schematics of IR distance / optocoupler ???
Coz  I hav a trouble with the output voltage, the output was variation beetween
0-5 voltage not exactly 0v or 5v....

 

[audioguru2]

I hav a trouble with the output voltage, the output was variation between
0-5 voltage not exactly 0v or 5v.

There are many types of optocouplers: transistor, Schmitt-trigger logic, FET. You are probably using one with a transistor output. The transistor is linear so its output voltage depends on the strength of the IR beam that is shining on it.
If you want the transistor to conduct hard then shine a strong IR beam on it. If you want the transistor to be cutoff then turn off the IR beam. Or use an opto-coupler with Schmitt-trigger logic at its output.

 

[ronald_sas]

Thx...... ;D